MIC2172_06 Datasheet, PDF (5/20 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators

Micrel
Typical Characteristics MIC2172 (cont)
Parameter
Oscillator Section
Frequency (fO)
Condition
Duty Cycle [δ(max)]
Sync Coupling Capacitor
Required for Frequency
Lock
VPP = 3.0V
VPP = 40V
Input Supply Voltage Section
Minimum Operating
Voltage
Quiescent Current (IQ)
3V ≤ VIN ≤ 40V, VCOMP = 0.6V, ISW = 0
Supply Current Increase ∆ISW = 1A, VCOMP = 1.5V
(∆IIN)
Electrical Characteristics MIC3172
Note 1, 3. Unless otherwise specified, VIN = 5V.
Parameter
Reference Section
Feedback Voltage (VFB)
Condition
Pin 2 tied to pin 3
Feedback Voltage Line
Regulation
Feedback Bias Current
(IFB)
Error Amplifier Section
Transconductance
(∆ICOMP/∆VFB)
Voltage Gain
(∆VCOMP/∆VFB)
Output Current
3V ≤ VIN ≤ 40V
∆ICOMP = ±25µA
0.9V ≤ VCOMP ≤ 1.4V
VCOMP = 1.5V
Output Swing
Compensation Pin
Threshold
Output Switch Section
ON Resistance
High Clamp, VFB = 1V
Low Clamp, VFB = 1.5V
Duty Cycle = 0
ISW = 1A, VFB = 0.8V
Current Limit
Breakdown Voltage (BV)
Duty Cycle = 50%, TJ ≥ 25°C
Duty Cycle = 50%, TJ < 25°C
Duty Cycle = 80%, Note 2
3V ≤ VIN ≤ 40V
ISW = 5mA
April 2006
5
MIC2172/3172
Min Typ Max Units
88
100
112
kHz
85
115
kHz
80
89
95
%
22
51
120
pF
2.2
4.7
10
pF
2.7
3.0
V
7
9
mA
9
20
mA
Min Typ Max Units
1.224 1.240 1.264
V
1.214
1.274
V
0.07
%/V
310
750
nA
1100
nA
3.0
3.9
2.4
6.0 µA/mV
7.0 µA/mV
500 800 2000
V/V
125 175 350
µA
100
400
µA
1.8
2.1
2.3
V
0.25 0.35 0.52
V
0.8
0.9
1.08
V
0.6
1.25
V
0.76
1
Ω
1.1
Ω
1.25
3
A
1.25
3.5
A
1
2.5
A
65
75
V
M9999-041806
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